Kakavia (Greek Fish Soup)

In a large pot, add all ingredients except the courgettesand lemon juice and bring to a boil. Boil over a medium-high heat for 15 minutes, then add the courgettes. Cook for another 5 minutes. Add the fish. When it comes to a boil, cook for 20-25 minutes without a lid. Add the lemon juice at the end and serve with toasted bread.